29 June 2009
Earth to VmWare: make some DEBs, please
I've recently installed VmWare Server on a new box. For some reason, VmWare packages RPMs but not DEBs, so I had to do a nonstandard local install from the generic .tar.gz installer. That's not difficult, but now there is no way for me to track updates, including security-related ones.
Come on VmWare, get your act together: it's 2009, people expect this sort of feature these days. Since you bother to build RPMs, it's clear that you can package stuff properly if you want to. If you are not sure what distribution to pick in the sea of available Debian-clones, just track Debian-stable and let the community do the rest.
Labels: Debian, GeekDiary, vmware
posted by GiacomoL @ 1:40 PM
0 comments
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08 June 2009
07 June 2009
The pains of backward-compatibility
Problem:- you have several ZIP and TAR archives
- you have to replace ONE FILE in each of them
- you only have Python 2.5
From what I see, the only solution in this situation is to completely branch off the two cases, because the relevant Python modules (tarfile and zipfile) have such a completely different interface.
None of them can simply replace or delete one single file, so you have to unpack the entire archive, edit the file, repack. Inefficient, but consistent approach.
Then ZipFile object will read bytes, whereas TarFile objects will extract files.
Finally, ZipFile doesn't feature a method to extract all files in one go, like TarFile has. To be honest, zipfile sucks in pre-2.6 VMs.
This means that what you can really do (more or less) in the same way (with some essential metaprogramming) is opening/closing archives, listing the contained files, and adding new files.
Things are much, much better in 2.6 and 3.0, where both interfaces are almost the same, but if you are stuck with 2.5 (like me) then you'll have to do with inelegant solutions. And if you are reading this, maybe you'll waste less time.
(Memo to self: always, ALWAYS do the easiest thing that could possibly work, no matter how inelegant it is. Premature optimization really is the root of all evil.)
Labels: GeekDiary, python, tarfile, zipfile
posted by GiacomoL @ 7:54 PM
2 comments
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01 June 2009
note to self
When you start writing hacks like this:
for attr in ['Something1','someThing2'...'SomeThing215']:
self.__dict__[attr.lower()+'Widget'].do_something(someValue)
self.__dict__[attr.lower()+'Widget'].set_parameter(someparameter)
... it's probably time for a subclass.
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